<!DOCTYPE html> 
<html> 
 <head> 
  <meta charset="UTF-8"> 
  <title></title> 
  <style type="text/css"> 
   *{ 
    box-sizing: border-box; 
   } 
   .left{ 
    float: left; 
    width: 20%; 
    height: 650px; 
    color: red; 
    border: 1px solid red; 
    border-right: 20px solid cornflowerblue; 
   } 
   .center{ 
    position: relative; 
    float: left; 
    width: 60%; 
    height: 650px; 
    border: 1px solid darkcyan; 
   } 
   .chatList{ 
    width: 100%; 
    height: 500px; 
    overflow-y: scroll; 
   } 
   .bottom{ 
    position: absolute; 
    width: 100%; 
    height: 150px; 
    left: 0; 
    bottom: 0; 
    background: skyblue; 
   } 
   .bottom textarea{ 
    width: 70%; 
    height: 100%; 
    font-size: 18px;; 
    vertical-align: middle; 
    border: 1px solid red; 
    background: blanchedalmond; 
   } 
   .bottom input{ 
    width: 80px; 
    height: 40px; 
    margin-left: 30px; 
   } 
   .right{ 
    float: right; 
    color: #000000; 
    border-right: 0; 
    border-left: 20px solid cornflowerblue; 
   } 
  </style> 
 </head> 
 <body onload="loadTime()"> 
  <div class="left" id="left"> 
    
  </div> 
  <div class="center" id="center"> 
   <div class="chatList" id="chatList"> 
     
   </div> 
   <div class="bottom"> 
    <textarea id="content" name="content" ></textarea> 
    <input type="button" name="send" id="send" value="点击发送" onclick="sendMessage()" /> 
   </div> 
  </div> 
  <div class="left right"> 
   <p>1.不能发空消息</p> 
   <p>2.敏感字***显示</p> 
   <p>3.图片替换 开心，尴尬</p> 
   <p>4.显示聊天内容和时间</p> 
   <p>5.每发一条信息，随机显示名称，先把一些名称定义到array里面</p> 
  </div> 
   
 </body> 
 <script type="text/javascript"> 
//  document.getElementById("chatList").scrollHeight; 
 /* 
   添加敏感字替换成**---8.10 
  * */ 
  function loadTime(){ 
   var time = new Date(); 
    
   var hours = (time.getHours()).toString(); 
   if(hours.length < 2){ 
    hours = "0" + hours; 
   } 
   var minutes = (time.getMinutes()).toString(); 
   if(minutes.length < 2){ 
    minutes = "0" + minutes; 
   } 
   var seconds = (time.getSeconds()).toString(); 
   if(seconds.length < 2){ 
    seconds = "0" + seconds; 
   } 
   var timeReturn = hours + ":" + minutes + ":" + seconds; 
   document.getElementById("left").innerHTML = timeReturn; 
   return timeReturn; 
  } 
  setInterval("loadTime()",1000); 
  var chatContents = ""; 
  var count = 0; 
  function sendMessage(){ 
   //通过调用randomName()函数来得到一个随机的名字 
   var name = randomName(); 
   //通过调用randomColor()函数来得到一个随机的颜色 
   var colorR = randomColor(); 
   //得到textarea中的内容 
   var content = document.getElementById("content").value; 
   //判断输入内容是否为空 
   if (content == "") { 
    alert("输入内容不能为空！！！"); 
    return; 
   } 
   //通过正则表达式来获取要替换的字符串 
   var regExp = 0; 
   var regExp1 = /开心/g; 
   var regExp2 = /尴尬/g; 
//   var imgReplace = content.replace(regExp,"高兴"); 
   //获取开心图片路径 
   var path1 = '<img src="img/chui.png"/>'; 
   //获取尴尬图片的路径 
   var path2 = '<img src="img/mouse.png"/>'; 
   //敏感字替换； 
   content = content.replace(regExp,"***"); 
   //将开心替换成开心图片的字符串； 
//   txtReplace(content); 
   var imgReplace = content.replace(regExp1,path1); 
//   alert(imgReplace); 
   //将尴尬替换成尴尬图片的字符串； 
   imgReplace = imgReplace.replace(regExp2,path2); 
//   alert(imgReplace); 
   var chatContent = "<span>"+ name + ":" + "</span>" + " " + imgReplace; 
//   字符串拼接聊天记录 
   chatContents =chatContents + chatContent + " " + loadTime() +"<br/>"; 
   document.getElementById("chatList").innerHTML = chatContents; 
   //点击发送后，textarea中的内容设为空 
   document.getElementById("content").value = ""; 
   var txtColor = document.getElementsByTagName("span")[count]; 
   count++; 
   //设置span的随机颜色 
   txtColor.style.color = colorR; 
  } 
  function randomName(){ 
   var i = parseInt(Math.random() * (1 - 0 + 1) + 0); 
   var arrName = new Array("果果","明明"); 
   return arrName[i]; 
  } 
  function randomColor(){ 
   var r = parseInt(Math.random() * (255 - 0 + 1) + 0).toString(16); 
   if(r.length < 2){ 
    r = "0" + r; 
   } 
   var g = parseInt(Math.random() * (255 - 0 + 1) + 0).toString(16); 
   if(g.length < 2){ 
    g = "0" + g; 
   } 
   var b = parseInt(Math.random() * (255 - 0 + 1) + 0).toString(16); 
   if(b.length < 2){ 
    b = "0" + b; 
   } 
   return "#" + r + g + b; 
  } 
   
 </script> 
</html>